Re: Application level pentesting

[intel96 <intel96 () bellsouth net>]

Steven,

This test is blackbox, which means no manuals, no raw code and no
questions to the developers.

I have looked at most of the easy stuff already like open ports,
registry writes, and injecting false data into the two masked form
fields that the application displays.

I also tired using SPY++ to look at the application and any values that
it stores in the form fields.

The application uses two ports, but I have not idea what the ports are
for at this time, because the do not answer to anything even though they
are in listening mode. These also rotate ever few minutes, which is
another pain in the neck.......

I decompiled the code and I am now looking for the embedded passphrase
in the code that I was provided. The passphrase is not stored as a
string or as hex in the code. So I have to determine how else is it
stored within the code. This could be one of the biggest downfalls
within the code if I can find this value!

Thanks,

Intel96


salexander () frontporch com wrote:
> Sending random data over a network connection will only flush out the most obvious bugs.  Try sending data that is 
> mostly correct but deformed in particular ways.  For instance, include trailing data on an otherwise valid 
> request/command/etc or trim off a few bytes from an otherwise valid request, if there is an application-level header, 
> set invalid options and lengths.  What you can do depends on the expected structure of the traffic.  Are there 
> optional attributes that can be included?  What happens if you duplicate them?  If the application uses multi-stage 
> transactions (such as DHCP with discover/offer/request/acknowledge/release vs DNS with request/reply), try fudging 
> data at different stages of the transaction.
>
> Does the program store encryption keys in memory longer than needed?  This is easier to find in a code review than 
> during testing but you may be able to find out using a debugger and a known key.
>
> What is exposed to an attacker (open network ports, registry, files, etc)?  What can the attacker control?
>
> I hope this helps,
>
> Steven  
>
>
> -----Original Message-----
> From: intel96 [mailto:intel96 () bellsouth net]
> Sent: Fri 6/30/2006 9:42 AM
> To: pen-test () securityfocus com
> Subject: Application level pentesting
>  
> To all,
>
> I am pentesting an application that is written in several languages but
> is complied into a single application.  So looking at the application
> with FxCop or Reflector for .NET apps does not work.
>
> The application draws an image on the screen that cannot be moved.  The
> image has two values username and password.  The application only
> accepts mouse entries on a virtual keyboard, which rotates every 60
> seconds.  The application form fields which are masked with "*" cannot
> be read with applications like Foundstone's Showin.   Microsoft Spy++
> does cannot see the values in the form fields once they are entered. 
>
> The application writes nothing to the registry that can be used.  
>
> The application uses the following items when running:
>
> 1.  InternetFortezzaCard - part of WININET.dll
> 2. InternetInitializedAutoProxyDll - part of WININET.dll
> 3.  MSWSOCK.dll
> 4.  USER32.dll
> 5.  Kernel32.dll
>
> Sending random data to the open UDP (Foundstone UDPflood) and TCP
> (Foundstone Blast) ports does not crash the application. 
>
> Cramming random data into the username field does nothing.
>
> Does anyone have any recommendations on how to pentest the application
> deeper?
>
> Thanks,
>
> Intel96
>
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This List Sponsored by: Cenzic

Concerned about Web Application Security? 
Why not go with the #1 solution - Cenzic, the only one to win the Analyst's 
Choice Award from eWeek. As attacks through web applications continue to rise, 
you need to proactively protect your applications from hackers. Cenzic has the 
most comprehensive solutions to meet your application security penetration 
testing and vulnerability management needs. You have an option to go with a 
managed service (Cenzic ClickToSecure) or an enterprise software 
(Cenzic Hailstorm). Download FREE whitepaper on how a managed service can 
help you: http://www.cenzic.com/news_events/wpappsec.php 
And, now for a limited time we can do a FREE audit for you to confirm your 
results from other product. Contact us at request () cenzic com for details.
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